Editing MimeHandlerException issue mailbox.log zimbra indorama (section)

==Intermediate Solution==
We have installed the convertd RPM via rpm install from the main instal directory . And started the convertd service of zimbra.first of all check zimbra-convertd rpm package is installed if not than install this package using below command. you will get this package under your extracted "zcs/packages".

 #rpm -Uvh zimbra-convertd-8.6.0_GA_1153.RHEL6_64-20141215151258.x86_64.rpm

'''How to check convertd service status ?'''

 #zmconvertctl status
 convertd is not running.

'''How to start convertd service ?'''

 #zmconvertctl start

As convertd started , the mailbox log did not show any error and logging was normal . This has solved the issue . 
This solution was  temporary as every time the zimbra services were started , convertd will start by itself . Every time it has to be restarted manually which is not preferred .